Demountable burner



I A. F. HUBBARD 2,758,636

DEMOUNTABLE BURNER 7 Filed April 4, 1952 INVEN TOR. ARTHUR E HUBBARD ATTORNEY United States Patent Ofice Patented Aug. 14, 1956' 1 2,758,636 DEMOUNTA'BLE BURNER Arthur F. Hubbard, Moline, lll., assignor to American Air Filter Company, 'Inc., Louisville, Ky., a corporation of Delaware Application April 4, 1952, Serial No. 280,501 '1 Claim. (Cl. 158--7) This invention relates to portable liquid fuel burning heaters, and relates in particular to a heater of this type arranged .to be easily ignited even upon failure of the ignition system.

Heaters of this type are used extensively in military operations in cold climates for warming living or working quarters, warming aeroplane engines for easy starting, and the like. The failure of the ignition system would render the heater useless, even though the rest of the operating mechanism were in order. The rigorous climate precludes repairing the heater until it is removed to some warm sheltered location.

The present invention allows the burner to be ignited manually in a safe and easy manner, even though the operator may be encumbered by wearing heavy gloves or mittens. The invention will be described in greater detail in the following specification taken in connection with the accompanying drawing showing a preferred embodiment of the invention by way of example, and wherein:

Figure 1 is a fragmentary view, partly in section of a heater incorporating the invention;

Figure 2 is a rear elevation of Figure 1 showing the burner nozzle mounting; and

Figure 3 is a disassembled View of Figure 2.

Referring to the drawing, the heater which is mounted on a sledge or chassis so as to be portable, comprises an outer cylindrical jacket 2 having a cylindrical heat exchanger 3 within the jacket held in spaced relation thereto by U-shaped pads or lugs (not shown) so as to provide an air passageway 5 between the outer jacket 2 and the outer wall of the heat exchanger. The heat exchanger has a cylindrical peripheral Wall with an opening to which is secured a stack, a front end wall, and a rear end wall 7, the latter having an opening 8 which receives a tubular extension 9 fastened thereto. Flattened lune or crescent shaped tubes 11 spirally arranged in the end walls of the heat exchanger provide longitudinal passageways 12 [for flow of air to be heated through the heat exchanger. One such type of heat exchanger is described and claimed in Patent No. 2,421,371 to Stanley J. Budlane, and need not be described here in greater detail.

At its open outer end extension 9 carries side fingers or hooks 13, 13', each hook having a vertical slot 14, and then hook-s each end in a knob or bill 15. A cap or cover plate 16 has an offset flange 17 around a central depressed portion 18, the flange being notched or cut away at 19 at diametrically opposite sections. This cap is received on the end of extension 9 with the depressed portion 18 received within the extension and the flange -17 resting on the edge of the extension so the notches 19 accommodate the hooks 13, 13'. This cover plate has :a central opening 21 to receive the burner nozzle 22, and a shoulder 23 on the burner nozzle engages the face of the cover plate. The burner nozzle is attached to a cross bar 24 in any suitable manner, and the cross bar preferably is offset to provide hook engaging portions 25, 25 and flared handle portions 26, 26'. The burner is of the bypass type, and flexible conduits 27, 28 carry fuel to the burner and carry away the bypass flow of fuel.

To assemble the burner nozzle to the heat exchanger the tip of nozzle 22 is inserted in hole 21 of cap 16 with the shoulder 23 engaging a shoulder on the cap to allow an air space around the burner tip; the cap and burner are placed against the end of extension 9 with the notches 19 accommodating the hooks 13, 13', and by rotating handles 26, 26 clockwise, as seen in Figure 2, the hook engaging portions 25, 25' are moved beyond the bills 15 into the slots 14 to hold the nozzle and plates in position. The burner nozzle provides a pivot in the cover to allow the cross bar to be rotated, and the bar 24 flexes sufficiently to allow the hook engaging portions 25, 25' to pass the bills. The resiliency of the bar causes it to engage the hooks to hold the burner and cap in position, the bills preventing accidental rotation of the bar. A spark plug 29 has its electrode 31 extending through a hole in the cover in proximity to a grounded electrode 32 on the cover "and acts as an igniter. The cover plate has openings 33 for admission of air, and tabs 34 over the openings act to deflect air toward the burner nozzle. Suitable openings 35 in the extension 9 also provide for admission of air to the burner. In operation, a fan at the rear end of the jacket 2 forces a steady stream of air past deflector 36 and radial vanes .37 into a plenum chamber 38, from which chamber some air flows to the burner through holes 33 and 35, and some air flows through passages 5 and 12.

A heater of this type is frequently required for operation in emergencies in arctic climates, under low temperature conditions. Where, because of failure of the ignition system, it is not possible to get a suitable spark at the igniter, or where, for any other reason it is not possible to ignite the :fuel issuing at the burner, this construction, nevertheless allows ignition of the fuel. It is only necessary to turn bar 24 enough to release and remove cover 16, whereupon a burning piece of paper, rag, or other torch or flambeau available can be thrown into the combustion chamber; and the cover is clapped back into place and fastened by a quick turn of bar 24 to bring portions 25, 25' into the slots 14 past the bills 15. The fuel jet is ignited by the burning paper so that the operation of the heater is easily started.

I claim as my invention:

In a combustion heater; a heat exchanger providing a combustion chamber open at one end; an end cover for the open end of said combustion chamber comprising a central depressed portion adapted to be received in said open end, and having an opening therein to receive a burner nozzle, and a surrounding flange adapted to seat on the rim of the combustion chamber; a pair of diametrically opposed slotted arms extending from the combustion chamber beyond said end of the combustion chamber; a resilient cross bar; and a burner nozzle secured to said cross bar and having a reduced end received in the opening in the cover, the cross bar being adapted to enter the slots in said slotted arms by a turning movement with the burner as the pivot, and the resilient cross bar serving to hold the burner nozzle and cover assembled to the combustion chamber.

References Cited in the file of this patent UNITED STATES PATENTS 807,286 King Dec. 12, 1905 910,024 Sprecher Jan. 19, 1909 1,062,042 Serviss May 20, 1913 1,324,607 Maclean Dec. 9, 1919 1,391,338 Morse Sept. 20, 1921 1,558,349 Graaif Oct. 20, 1925 2,386,807 Leslie Oct, 16, 1945 2,451,623 Leslie et al Oct. 19, 1948 2,537,054 Hildestad Jan. 9, 1951 2,548,904 Neal et a1. Apr. 17, 1951 FOREIGN PATENTS 198,370 Switzerland Sept. 1, 1938 

